dgr6853
Active Member
- Joined
- January 14, 2010
- Messages
- 61
- Reaction score
- 6
- City, State
- Stockton, Ca
- Year, Model & Trim Level
- 2003 Lincoln aviator
My Aviator has had an occasional misfire. It started with Cylinder 7 and then spread to cylinder 4. This has been going on now for about a month. I do get an accumulation of oil on the passenger head spark plug wells.--I think I have a bad valve cover gasket. I simply drain them and burn them off and when I did that about a week ago, the misfires went away but they have come back. Right now I have
p0304-cylinder 4 misfire detected
p0316-misfire detected on startup (first 1000 rpms)
p0307-cylinder 7 misfire detected.
Also, every now and then I get a "multiple random misfire detected" though it is not showing right now. in the past that ""multiple random misfire detected" has shown up but I have since reset and cleared the DTC's.
My next step is going to be to start replacing coils one by one. I know the Motorcraft ones are good. However, Autozone doesn't have that and it looks like what they have are a bunch of duralast coils and they have a set of Denso's. Just wondering if anyone has any experience with the Denso coil packs or if there is another coil pack brand I should consider.
Also, looking for any ideas as to where this could be coming from. Considering that I know it could be compression issues like valves not closing or rings needing work or even fuel delivery like faulty injectors.
I think I'm going to start chasing it down with coils first. Also, I wanted to know if this engine with The COP coils have the paired cylinders like cobras that have the two main coil packs at the front of the engine.....it would appear so because if usually cylinder 7 and 4 are paired cylinders. My understanding is that with paired cylinders then if 7 or 4 are misfiring then both are misfiring.
Thanks in advance for your help.
Thank You,
p0304-cylinder 4 misfire detected
p0316-misfire detected on startup (first 1000 rpms)
p0307-cylinder 7 misfire detected.
Also, every now and then I get a "multiple random misfire detected" though it is not showing right now. in the past that ""multiple random misfire detected" has shown up but I have since reset and cleared the DTC's.
My next step is going to be to start replacing coils one by one. I know the Motorcraft ones are good. However, Autozone doesn't have that and it looks like what they have are a bunch of duralast coils and they have a set of Denso's. Just wondering if anyone has any experience with the Denso coil packs or if there is another coil pack brand I should consider.
Also, looking for any ideas as to where this could be coming from. Considering that I know it could be compression issues like valves not closing or rings needing work or even fuel delivery like faulty injectors.
I think I'm going to start chasing it down with coils first. Also, I wanted to know if this engine with The COP coils have the paired cylinders like cobras that have the two main coil packs at the front of the engine.....it would appear so because if usually cylinder 7 and 4 are paired cylinders. My understanding is that with paired cylinders then if 7 or 4 are misfiring then both are misfiring.
Thanks in advance for your help.
Thank You,